This document may not be reproduced in full or in part without the written consent of Marshall Day Acoustics Limited Rp 001 R0 20210601 SJP (Waihi North Noise Assessment) ISSUE 29 of 79 However, the overall conclusion that a small adverse effect is predicted to occur for a small number of houses and mitigation for these receivers is recommended. This recommendation is fully adopted in the proposed conditions, which set out a mechanism to be followed to ensure noise levels do not exceed the project criteria at any dwelling (not owned by OGNZL or subject to an agreement with OGNZL). This mechanism is primarily focussed on the use of a management plan approach, this is broadly similar to the nationwide use of such management plans to control construction noise. The key difference in this case is that there is no scope to exceed the noise limits in the proposed conditions. This provides the certainty that the noise effects for all dwellings would be acceptable In summary, the proposed conditions require that a noise management plan (NMP) be prepared to outline the methods to be used to ensure noise levels do not exceed 50 dB at any residence. The NMP will prescribe a noise mitigation development process that will occur prior to operations commencing, that will set out the options considered and provide certification that noise levels comply. These options would include (but not be limited to): • The use of quieter machinery (determined by a noise source characterisation procedure) • Restrictions on operating hours • Bespoke screening of individual sources • Screening of noise sensitive receivers • Noise monitoring programmes (including noise modelling and measurement regimes, which can be continuous or targeted) • Investigation of bespoke noise monitoring software to allow proactive management of site noise emissions before non-compliance occurs Further discussion on mitigation options is given in Section 11, and an example of an initial mitigation analysis process that the NMP may adopt is given in Appendix C. In this case a series of screening options were considered. As the proposed conditions require compliance to be achieved through the use of a NMP, then we consider that GOP noise emissions would be adequately managed and that therefore the resultant noise effects would be acceptable. Figure 15: 50 dB LAeq noise contour for GOP operations 2024-2026 (cumulative levels, no mitigation) with ‘Representative Receiver’ locations
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